FILE *			T_STDIO
PerlIO *		T_INOUT
FileHandle		T_PTROBJ
InputStream		T_IN
InOutStream		T_INOUT
OutputStream		T_OUT
##</code><code>##

T_STDIO
	$var = PerlIO_findFILE(IoIFP(sv_2io($arg)))
T_IN
	$var = IoIFP(sv_2io($arg))
T_INOUT
	$var = IoIFP(sv_2io($arg))
T_OUT
	$var = IoOFP(sv_2io($arg))